Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d0f6945d5a9672…

MALICIOUS

PDF

66.9 KB Created: 2020-11-21 07:54:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a55a52e0feab1be4a651cdb4d8ad46b7 SHA-1: 3612bb2cc4c003411a20e91fc9fd21f5993fcef8 SHA-256: 31d0f6945d5a9672eab89093f8380251a59b64551b1adf26088785f069efd90a
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate it's a malicious redirector and part of a link farm, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection further confirm its malicious nature. Although no scripts were extracted, the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/123?utm_term=best+anime+drawing+websites In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f87c6b720475.pdfIn PDF document text
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/5d6a0876c6b18c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424400/normal_5f99dab8295e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bfebd25-80b7-46cb-aec3-c9c4d57a41cc/5586421129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac7974e-fa24-49cf-bed2-320f46890317/9320045900.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/latibodalumugupofelarulem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3efd413f-8d09-45e6-9d3c-20df62865bb3/tipo_de_planes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca6b61ea-8fa6-4896-8e60-261909b86afe/defatoginarobameduz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b737b1-378d-4f2d-901b-e80a775267f6/dabomobivezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b86b33c-7746-4134-9a1b-4f3bafd928da/answer_for_subtraction_is_called.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dffa1857-ceb3-4308-9944-451d04fb036b/chronomancy_spells_5e.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 5396 bytes
SHA-256: f70f278aa80745150774ea8ba9ca14f14f72a45035f253cea8de7bfb4c502662
font_01_sfnt_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 9920 bytes
SHA-256: a9f9214d8753d7291e0d62207039272d5573ae711e008f8fb654ffb05c32eef5

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